package com.example.tmxk.dao;

import com.example.tmxk.bean.NewsBean;
import com.example.tmxk.util.DBConnection;

import java.sql.*;
import java.util.ArrayList;
import java.util.List;
import java.util.Date;
public class NewsDao {
    DBConnection DBConn = new DBConnection();

    // todo 后期添加分页功能
    public List<NewsBean> getList(int page) {
        Connection conn = DBConn.getConn();
        String sql = "select * from news limit " + (page - 1) * 10 + ",10";
        List<NewsBean> list = new ArrayList<NewsBean>();
        list = null;
        try {
            Statement statement = conn.createStatement();
            ResultSet rs = statement.executeQuery(sql);
            while (rs.next()) {
                NewsBean newsBean = new NewsBean();
                newsBean.setNewsID(rs.getInt("NewsID"));
                newsBean.setNewsTitle(rs.getString("NewsTitle"));
                newsBean.setNewsContent(rs.getString("NewsContent"));
                newsBean.setNewsTime(rs.getString("NewsTime"));
                newsBean.setAdminName(rs.getString("AdminName"));
                list.add(newsBean);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return list;
    }

    /**
     * 添加新闻
     *
     * @param news
     * @return
     */

    public int add(NewsBean news) {
        Connection conn = DBConn.getConn();
        String sql = "insert into news values(null,?,?,?)";
        try {
            PreparedStatement pmst = conn.prepareStatement(sql);
            pmst.setString(1, news.getNewsTitle());
            pmst.setString(2, news.getNewsContent());

            pmst.setString(3, (new Date()).toString());
            return pmst.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return 0;
    }

    /**
     * 更新功能
     *
     * @param news
     * @return
     */
    public int update(NewsBean news) {
        Connection conn = DBConn.getConn();
        String sql = "update news set NewsTitle=?,NewsConten=?,NewsTime=?,NewsName=? where NewsID=?";
        try {
            PreparedStatement pmst = conn.prepareStatement(sql);
            pmst.setString(1, news.getNewsTitle());
            pmst.setString(2, news.getNewsContent());
            pmst.setString(3, (new Date()).toString());
            return pmst.executeUpdate(sql);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return 0;
    }

    public int delete(int newsID) {
        Connection conn = DBConn.getConn();
        try {
            String sql = "delete from news where NewID=?";
            PreparedStatement pmst = conn.prepareStatement(sql);
            pmst.setInt(1, newsID);
            return pmst.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return 0;
    }

    /**
     * 统计新闻总条数
     *
     * @return
     */
    public int count() {
        Connection conn = DBConn.getConn();
        try {
            String sql = "select count(*) from news";
            Statement statement = conn.createStatement();
            ResultSet rs = statement.executeQuery(sql);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return 0;
    }

    public NewsBean getNewsByID(int id) {
        try {
            String sql = "select * from news where NewsID=?";
            NewsBean newsBean = new NewsBean();
            Connection conn = DBConn.getConn();
            PreparedStatement pmst = conn.prepareStatement(sql);
            pmst.setInt(1, id);
            ResultSet rs = pmst.executeQuery();
            if (rs.next()) {
                newsBean.setNewsID(rs.getInt(1));
                newsBean.setNewsTitle(rs.getString(2));
                newsBean.setNewsContent(rs.getString(3));
                newsBean.setNewsTime(rs.getString(4));
                newsBean.getAdminName(rs.getString(5));
                return newsBean;
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }
}
